According to the American Association of Orthodontists, an estimated 5 million Americans are undergoing orthodontic care; 1.5 million of those are 18 or older.
from https://www.postbulletin.com/life/health/orthodontic-checkups-can-prevent-serious-health-issues-for-adults-children/article_f7bef1f6-09c4-5e30-99cc-d5538167a4a6.html
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